[問題] 找四環有幾個，有沒有比O(n^3)快的算法
看板Prob_Solve (計算數學 Problem Solving)作者rareone (拍玄)時間7年前 (2017/08/23 00:17)推噓10(10推 0噓 12→)留言22則, 4人參與討論串1/1
四環（4-cycle）
在圖上我們稱他<a,b,c,d,a>使得四個點a,b,c,d依序相鄰
我想問問大神存不存在比O(n^3)還快地找四環計數算法
算出一張simple graph上有幾個4-cycle
拜託了>_< 我想過judge
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